[NEWS] Oracle TNS Listener DoS and Remote Memory Inspection

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Oracle TNS Listener DoS and Remote Memory Inspection
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SUMMARY

The TNS Listener can be crashed by an attacker causing a Denial of
Service; alternatively the attacker can use the same flaw to expose memory
contents remotely. This may reveal sensitive information.

DETAILS

There is a bug in GIOP service that can allow an attacker to crash the TNS
Listener and/or dump memory. A DWORD in the connect GIOP packet is trusted
as the size of the data in the packet.

By setting this to a large value (e.g. 0 1FFFF) causes the listener to
allocate this much memory then attempt to copy this much data to it -
which eventually leads to a read access violation because the source data
is less than this number and the process lands in uninitialized memory.
If the attacker uses a smaller number, e.g. 0xFFFF they can dump this many
bytes from memory.

This may reveal sensitive information such as the TNS Listener password.

Vendor Status:
Oracle was alerted to this flaw on the 22nd of June 2006. A patch has now
been made available:

<http://www.oracle.com/technology/deploy/security/critical-patch-updates/cpuoct2007.html> http://www.oracle.com/technology/deploy/security/critical-patch-updates/cpuoct2007.html

ADDITIONAL INFORMATION

The information has been provided by <mailto:davidl@ngssoftware.com>
David Litchfield.
The original article can be found at:

<http://www.ngssoftware.com/advisories/high-risk-vulnerability-in-oracle-tns-listener/> http://www.ngssoftware.com/advisories/high-risk-vulnerability-in-oracle-tns-listener/

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